.cover {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    /* 透明度 */
    /* opacity: 0.9; */
    background-color: rgba(0, 0, 0, 0.5);
    /* display: flex;
    justify-content: center;
    align-items: center; */
}

.dialog {
    padding: 28px;
    width: 360px;
    height: 424px;
    background-color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    /* margin-top: -240px;
    margin-left: -208px; */
    transform: translate(-50%, -50%);
    /* top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto; */
}